[capi-sig] How to initialize state for C created threads

[Mark Hammond]

On 18/10/2010 1:00 PM, Nikolaus Rath wrote:
> Hello,
>
> I am starting threads in a C extension. If I understand correctly,
> successive sequences of PyGILState_Ensure() and PyGILState_Release will
> create and destroy the Python thread state over and over again, so e.g.
> objects stored with threading.Local() will not persist.
>
> Can someone explain to me how I can initialize and destroy the thread
> state manually (i.e., right after creating and destroying the thread
> with pthreads), so that PyGILState_* will just acquire and release the GIL?

You can just Ensure as your thread starts and the Release as it 
terminates.  You can then use the normal 
Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS macros to release the GIL as 
appropriate.

HTH,

Mark